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<h1>Data Access Client Overview</h1>
<p>A light-weight OPC UA DA Client that provides minimal capabilities and 
 merely demonstrates the simple data-acquisition from an OPC UA DA Server.</p>
<h2><a name="gui"></a>User Interface</h2>
<p class="Picture"><img src="image81.gif" alt="" style="border: none;" 
						 border="0" /></p>
<h2>Screen Elements</h2>
<table style="border-collapse: separate; border-collapse: separate;" cellspacing="0" 
		 width="100%" border="1">
	<col style="width: 23.705%;" />
	<col style="width: 76.295%;" />
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Menus</span></p></td>
		<td style="vertical-align: Top;"><ul type="disc">
			<li><p><span style="font-weight: bold;">File</span></p></li>
			<ul type="disc">
				<li><p><span style="font-weight: bold;">Exit:</span> Quit 
				 the application</p></li>
			</ul>
			<li><p><span style="font-weight: bold;">Server</span>:</p></li>
			<ul type="disc">
				<li><p><span style="font-weight: bold;">Discover</span>: 
				 Invokes the &quot;<a href="UaGenericClientDiscovery.htm">Discover 
				 Servers</a>&quot; dialog.</p></li>
				<li><p><span style="font-weight: bold;">Connect</span>: 
				 Connects to the selected endpoint. The same as the &quot;Connect&quot; 
				 button.</p></li>
				<li><p><span style="font-weight: bold;">Disconnect</span>: 
				 Disconnects a current connection.</p></li>
				<li><p><span style="font-weight: bold;">Select Locale</span>: 
				 Opens the &quot;Select Locale&quot; dialog where you can 
				 choose &quot;US-EN&quot;.</p></li>
				<li><p><span style="font-weight: bold;">Set User</span>: 
				 not implemented.</p></li>
			</ul>
			<li><p><span style="font-weight: bold;">View</span>: not implemented</p></li>
			<li><p><span style="font-weight: bold;">Monitored Items</span>:</p></li>
			<ul type="disc">
				<li><p><span style="font-weight: bold;">Load</span>: not 
				 implemented</p></li>
				<li><p><span style="font-weight: bold;">Save</span>: not 
				 implemented</p></li>
			</ul>
			<li><p><span style="font-weight: bold;">Help</span>: </p></li>
			<ul type="disc">
				<li><p><span style="font-weight: bold;">Contents</span>: 
				 Launches this help file.</p></li>
			</ul>
		</ul></td>
	</tr>
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Banner</span></p></td>
		<td style="vertical-align: Top;"><p>Shows the OPC Foundation logo 
		 and a [clickable] link to the website, shows the application name 
		 in large text, and shows the Certification logo with a link for 
		 more information online.</p></td>
	</tr>
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Endpoint Bar</span> (below banner)</p></td>
		<td style="vertical-align: Top;"><p><img src="image38.gif" alt="" 
												 style="border: none;" 
												 border="0" /></p>
		<p>There are 3 key areas in the endpoint bar: </p>
		<ul type="disc">
			<li><p><span style="font-weight: bold;">Endpoint Url</span><span>: 
			 the endpoint URL (of a Server) to connect to.</span></p></li>
			<li><p><span style="font-weight: bold;">Use Security</span><span>: 
			 (checkbox) if checked will use a secure session, if unchecked 
			 then will use a raw/insecure session.</span></p></li>
			<li><p><span style="font-weight: bold;">Connect button</span><span>:</span> 
			 clicking this will attempt to connect to the specified endpoint.</p></li>
		</ul></td>
	</tr>
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Address Space Navigation</span> (left)</p></td>
		<td style="vertical-align: Top;"><p>A simple node browser that 
		 allows you to navigate the UA Server's address space, behaving 
		 much like a file and folder browser (such as Windows Explorer):</p>
		<p><img src="image37.gif" alt="" style="border: none;" border="0" /></p>
		<p>A context menu for this control exists and is described below.</p></td>
	</tr>
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Data Value Display</span> (right)</p></td>
		<td style="vertical-align: Top;"><p>A simple display of the attributes 
		 for the currently selected Node (in the <span style="font-style: italic;">address 
		 space navigation</span><span>): </span></p>
		<p><span><img src="image39.gif" alt="" style="border: none;" border="0" /></span></p></td>
	</tr>
	<tr>
		<td style="vertical-align: Top;"><p style="text-align: center;"><span 
		 style="font-weight: bold;">Event Notifications</span> (bottom)</p></td>
		<td style="vertical-align: Top;"><p>A simple log output of events 
		 that received by the client: </p>
		<p class="Picture"><img src="image40.gif" alt="" style="border: none;" 
								 border="0" /></p>
		<p>A context-sensitive menu exists for this control and is described 
		 below.</p></td>
	</tr>
</table>
<h2>Address Space Navigation Context Menu</h2>
<p class="Picture"><img src="image82.gif" alt="" style="border: none;" 
						 border="0" /></p>
<h4>Monitor</h4>
<p>Adds the selected item to the current subscription. The subscription 
 is created automatically. The item's changes are shown in the &quot;Event 
 Notifications&quot; area.</p>
<h4>Write</h4>
<p class="Picture"><img src="image83.gif" alt="" style="border: none;" 
						 border="0" /></p>
<p>Specify a new value and press OK.</p>
<h4>Read History...</h4>
<p>The &quot;Read History&quot; option will only work when the selected 
 node is historizing.</p>
<h2>Event Notifications Context Menu</h2>
<p class="Picture"><img src="image84.gif" alt="" style="border: none;" 
						 border="0" /></p>
<h4>Delete</h4>
<p>Remove the currently selected node(s) from the subscription.</p>
<h4>Write</h4>
<p class="Picture"><img src="image83.gif" alt="" style="border: none;" 
						 border="0" /></p>
<p>Specify a new value and press OK.</p>
<h4>Monitoring Mode</h4>
<p>Three options exist to control the sampling mode of the currently selected 
 node(s): </p>
<ul type="disc">
	<li><p>Disabled</p></li>
	<li><p>Sampling</p></li>
	<li><p>Reporting</p></li>
</ul>
<p>These options are described in <a href="http://www.opcfoundation.org/ua/part4"><?rh-udv_start 
	 name="UaSpec04" ?>UA Specifications Part 4 - Services (http://www.opcfoundation.org/ua/part4)<?rh-udv_end ?></a>.</p>
<h4>Sampling Interval</h4>
<p>Four options are available enabling you to specify the sampling interval 
 for the currently selected node(s): </p>
<ul type="disc">
	<li><p>fast as possible</p></li>
	<li><p>1000ms</p></li>
	<li><p>2500ms</p></li>
	<li><p>5000ms</p></li>
</ul>
<h4>Deadband</h4>
<p>Three options exist here:</p>
<ul type="disc">
	<li><p>None: Disables deadband</p></li>
	<li><p>Absolute: a menu providing these options: </p></li>
	<ul type="disc">
		<li><p>5</p></li>
		<li><p>10</p></li>
		<li><p>25</p></li>
	</ul>
	<li><p>Percent: a menu providing these options.</p></li>
	<ul type="disc">
		<li><p>1%</p></li>
		<li><p>5%</p></li>
		<li><p>10% </p></li>
	</ul>
</ul>
<p><span style="font-weight: bold;">Absolute</span> deadband is described 
 in <a href="http://www.opcfoundation.org/ua/part4"><?rh-udv_start name="UaSpec04" ?>UA Specifications Part 4 - Services (http://www.opcfoundation.org/ua/part4)<?rh-udv_end ?></a>.</p>
<p><span style="font-weight: bold;">Percent</span> deadband is described 
 in <a href="http://www.opcfoundation.org/ua/part8"><?rh-udv_start name="UaSpec08" ?>UA Specifications Part 8 - Data Access (http://www.opcfoundation.org/ua/part8)<?rh-udv_end ?></a>.</p>
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